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Geochemical characteristics of pyrolysis gas from epimetamorphic rocks in the northern basement of Songliao Basin,Northeast china

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Science china Earth Sciences 2008年第S1期51卷 140-147页

作者： YANG Chun 1 ,LUO Xia 2 ,LI Jian 2 ,LI ZhiSheng 2 ,LIU QuanYou 3 &Wang YuLin 4 1 department of Earth Sciences,Zhejiang university,Hangzhou 310027,china 2 Research Institute of petroleum Exploration and Development(Langfang Branch),Langfang 065007,china 3 Research Institute of petroleum Exploration and Development,beijing 100083,china 4 department of Source and Environment,Liaoning Technical university,Fuxin 123000,china department of Earth Sciences Zhejiang University Hangzhou China Research Institute of petroleum Exploration and Development (Langfang Branch) Langfang China Research Institute of petroleum Exploration and Development Beijing China department of Source and Environment Liaoning Technical University Fuxin China

The Xushen gas field,located in the north of Songliao Basin,is a potential giant gas area for china in the *** proved reserves have exceeded 1000×10 8 m 3 by the end of ***,the origin of natural gases from the deep strata is still in *** rocks as a potential gas source are widely spreading in the northern basement of Songliao *** to pyrolysis experiments for these rocks in the semi-confined system,gas production and geochemistry of alkane gases are discussed in this *** Carboniferous-Permian epimetamorphic rocks were heated from 300℃to 550℃,with temperature interval of 50℃.The gas production was quantified and measured for chemical and carbon isotopic *** show thatδ13C 1 is less than?20‰,carbon isotope trend of alkane gas isδ13C 1 2 2 >δ13C 3 ,these features suggest that the gas would be coal-type gas at high-over maturity,not be inorganic gas with reversal trend of gaseous alkanes (δ13C 1 >δ13C 2 >δ13C 3 ).These characteristics of carbon isotopes are similar with the natural gas from the basin basement,but disagree with gas from the Xingcheng ***,the mixing gases from the pyrolysis gas with coal-typed gases at high-over maturity or oil-typed gases do not cause the reversal trend of carbon *** gas generation intensity for epimetamorphic rocks is 3.0×10 8 ―23.8×10 8 m 3 /km 2 ,corresponding to Ro from 2.0%to 3.5%for organic matter.

关键词： Northern Songliao Basin epimetamorphic rock pyrolysis experiment gas generation potential carbon isotope

The Instability of Void Fraction Waves inVertical Gas-Liquid Two-Phase Flow

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Communications in Nonlinear Science and Numerical Simulation 1999年第3期4卷 181-186页

作者： Baojiang SUN Dachun YAN and Zhen ZHANG(department of petroleum Engineering, university of petroleum, Shandong 257062,china)(department of Mechanics and Engineering Science, Peking university, beijing 100871,china)E-mail: suubj@*** department of petroleum Engineering University of Petroleum Shandong 257062 China department of Mechanics and Engineering Science Peking University Beijing 100871 China

IntroductionVOidfractionwavesisalsonamedconcentrationwavesorkinematicwavesingas-liquidtwo-phaseflow[1].***dfractionoftheflowpipes... 详细信息

IntroductionVOidfractionwavesisalsonamedconcentrationwavesorkinematicwavesingas-liquidtwo-phaseflow[1].***dfractionoftheflowpipes...

关键词： gas-liquid two-phase flow void fraction waves instability non-linear

SERIES REPRESENTATION OF DAUBECHIES' WAVELETS

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Journal of Computational Mathematics 1997年第1期15卷 81-96页

作者： X.G. Lu (department of Applied Mathematics, Tsinghua university, beijing, china) 清华大学应用数学系北京

This paper gives a kind of series represeotation of the scaling functions φNand the associated wavelets . constructed by Daubechies. Based on Poission sununation formula, the functions gh. φN(x+N-1), φN (x+N),'''' φN (x+2N-2)(Ox 1) are linearly represented by φN(x), φN(x + 1),''', φN(x + 2N - 2) and some polynomials of order less than N, and φ0(x):= (φN (x), φN (x + 1),''', φN (x + N -2))t is translated into a solution of a nonhomogeneous vectorvalued functional equationwhere A0, A1 are (N - 1) x (N - 1)-dimensional matrices, the components of P0(x), P1 (x) are polynomials of order less than N. By iteration, .φ0(x) is eventualy represented as an (N - 1)-dimensional vector series with vector norm where and

关键词： Pro ER Math Si WAVELETS SERIES REPRESENTATION OF DAUBECHIES

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Saturated models

Chinese Science Bulletin 1998年第7期43卷 562-564页

作者： CHEN Guolong department of Mathematics, beijing Normal university, beijing 100875, china department of Mathematics Beijing Normal University Beijing China

An equivalent description of saturated models is given, and some properties of countable saturated models, almost saturated models and full models are discussed. New proofs of two important theorems of the related doc... 详细信息

关键词： almost saturated model full model power type.

Empirical likelihood confidence regions of the parameters in a partially linear single-index model

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Science china Mathematics 2005年第10期48卷 1333-1348页

作者： XUE Liugen~1 & ZHU Lixing~2 1. College of Applied Sciences,beijing university of Technology,beijing 100022,china 2. department of Mathematics,Hong Kong Baptist university,Hong Kong,china College of Applied Sciences Beijing University of Technology Beijing China department of Mathematics Hong Kong Baptist University Hong Kong China

In this paper, a partially linear single-index model is investigated, and three empirical log-likelihood ratio statistics for the unknown parameters in the model are suggested. It is proved that the proposed statistics are asymptotically standard chi-square under some suitable conditions, and hence can be used to construct the confidence regions of the parameters. Our methods can also deal with the confidence region construction for the index in the pure single-index model. A simulation study indicates that, in terms of coverage probabilities and average areas of the confidence regions, the proposed methods perform better than the least-squares method.

关键词： partially linear single-index model, empirical likelihood, confidence region, chi-square distribution, coverage probability.

Recovery of functions via their irregular sampling values

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Chinese Science Bulletin 1998年第4期43卷 268-271页

作者： FANG Gensun department of Mathematics, beijing Normal university, beijing 100875, china department of Mathematics Lkijing Normal University Beijing China

It is proved that if a function can be completely reconstructed by tempered splines which satisfy the real Kiesz basis condition as the degree of spline goes to infinity, then the function is band limited.

关键词： band limited function cardinal splines irregular sampling.

Electrical Properties of Expanded Graphite Intercalation Compounds

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Journal of Materials Science & Technology 2001年第3期17卷 371-374页

作者： Xiuyun CHUAN department of Geology, Peking university, beijing 100871, china Daizhang CHEN and Xunruo ZHOU department of Materials Science, china university of geosciences, beijing 100083, china E-mail: cxyljhcj@*** Dept. of Geol. Beijing Univ. Beijing 100871 China

The intercalation compounds of CuCl2 were synthesized with expanded graphite, whose magnitude of the electrical conductivity is about 10(3)S(.)cm(-1). Their electrical conductivity is 3 similar to6 times as high as that of the expanded graphite, and about 10 times as high as that of GIC made of the non-expanded graphite. The microanalysis results of chemical compounds by X-ray energy spectrum scanning of TEM testified that the atomic ratio of chloride and cupric is nonstoichoimetric. The multivalence and exchange of electrovalence of the cupric ion was confirmed by the XPS-ESCA. Vacancy of chlorine anion increases the concentration of charge carrier. The special stage structure, made of graphite and chloride, produces a weak chemical bond belt and provides a carrier space in the direction of GIC layer. These factors develop the electrical properties.

关键词： In Ph Electrical Properties of Expanded Graphite Intercalation Compounds Graphite ESCA

THE EXISTENCE OF J-HOLOMORPHIC CURVES AND APPLICATIONS TO THE WEINSTEIN CONJECTURE

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Chinese Annals of Mathematics,Series B 1999年第4期20卷 425-434页

作者： MA RENYI(department of Applied Mathmatics, Tsinghua university, beijing 100084, china) department of Applied Mathmatics Tsinghua University Beijing 100084 China

The author first proves the existences of J-holomorphic curves in the symplectizations of Legendre fibrations and then as an application confirms the Weinstein conjectures on contact manifolds of Legendre fibrations. As a corollary a new proof on the theorem due to Hofer,Viterbo, Gluck, Ziller, Weinstein and Ljusternik-Fet Theorem is provided, which is quite different from their original proofs.

关键词： Symplectic geometry J-holomorphic curves Periodic orbit

Texture Analysis of Superconducting Films Based on YBCO System

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International Journal of Minerals,Metallurgy and Materials 2000年第2期14卷 107-109页

作者： Nan Chen Weimin Mao(Material Science and Engineering School, university of Science and Technol0gy beijing, beijing 100083 china)(department of Materials Science and Engineering, university of petroleum, beijing 102200, china) Material Science and Engineering School University of Science and Technology Beijing Beijing 100083 China department of Materials Science and Engineering University of Petroleum Beijing 102200 China

Textures in different layers of superconductors based on YBCO system are analyzed using the methods of pole figure and con-ventional φ scans. It is shown that the φ scanning technology has only 1-dimensional description and could omit some information of3-dimensional orientaion distribution, which will influence the superconductor quality The pole figure method, in contrast, demonstra-tes the orientation distribution 2-dimensionally and gives a comprehensive view of thin filIn textUr, which is a much bettCr method fortexture analysis in superconducting films, in which there is commonly an unique high sharpness textur component.

关键词： superconductor thin film texture YBCO pole figure